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Have you tried deal extreme.com? You can buy the Cree products there plus driver circuits and other accessories. I bought some 6 w LED from eBay. They were the right color but aren't very bright and one failed after 6 months of light driving...I had a company car that I drive most of the time.

So, I decided to try and retrofit something else into the housings from the failed eBay led. I gave up because it was more work than I thought. Also, its critical to get the placement "just right" or else you lose some brightness.

There is some dude in my neighborhood who drives a silver e39. His halos look awesome. Next time I see it i'm going to follow him home and see what is the setup.

Right now I'm using the original yellow bulbs. I think the rings with embedded LEDs are the most effective.

honestly get the LED Rings... I tried the LED bulbs and paid a pretty penny for them, but i didn't like the weak light output, plus the oem angels have a little yellow tint to it, so it didnt give me the color i wanted. If you check post #12 you'll see the picture of the LED bulb vs LED rings... And honestly pictures were taken from my crappy blackberry... It looks alot nicer in person